Can this be placed somewhere in the evolutionary process? Can the linguistic revolution be explained without free choice?

I think so. I dont see any necessity for free will in the background of language development. By the way, animals also have languages at one level or another. But the differences between us and them do not necessarily lie in the fact that we have free will; they may lie in differences in intelligence.
True, regarding intelligence I once wrote a column in which I argued that deterministic creatures have no intelligence. But that is a general claim. As for language development, in my opinion there is nothing unique about it in this respect.

Still, is there any suggestion for where to place this in the evolutionary process? Or in other words, what is it about human beings that compels you to conclude that there is free choice, and accordingly from what stage in history must we already assume it?
Or perhaps it comes from introspection, and therefore it cannot be projected onto earlier events? Shouldnt such a significant change leave some mark on historical events?
The same question applies in terms of interpreting the biblical description.

I dont understand what you expect beyond what I wrote. Indeed, the conclusion that we have choice is a result of observing the present. I dont know how to say anything about the past. We are talking about the distant past, so it is not reasonable to expect clear historical traces of this change.